1.
They were relieved that they had passed the exams
It was relieved that they had passed the exams
Having passed the exams was relieved to them.
2.
The teachers are aware that non-academic subjects are also significant
It is aware that non-academic subjects are also significant
3.
She is confident that Viet Nam has good potential for tourism
4. The residents were annoyed that a new railway track was being built throught the village
5. It was so smart of her to be able to solve the Maths problem
6. It was confident of him to say that everything would go as planned
7. It was surprising for visitors to find that the country has changed dramatically within a very short time
8. Everyone was glad to learn that the government had decided to invest more in education